Physiology of mango (Mangifera indica L.): fractions of carbohydrates and nitrogen and related enzymes in leaves of flowered and non-flowered shoots of mango.
Devi T. M., Tyogi D. N.
Author Affiliation: Department of Plant Physiology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221?005, India.
Indian Journal of Plant Physiology 34 : 30-36
Abstract : Leaves were collected at monthly intervals between 10 Sep. 1987 and Jan. 1988 from branches which had flowered or not flowered in 1987 on trees of cultivars Langra (irregular bearing) or Mallika (regular bearing). Leaf non-reducing sugar, total soluble sugar, alcohol insoluble N and total N contents and nitrate reductase activity were higher on branches which had flowered, whereas leaf reducing sugar, starch and alcohol soluble N contents and C:N ratio were higher on branches which had not flowered. It is suggested that the higher leaf C:N ratio on branches which had not flowered in 1987 indicates an accumulation of carbohydrates ready for flowering in the following year. There was a significant increase in leaf C:N ratio in Oct. on branches of Langra which had not flowered which was not apparent in Mallika. Significant correlations were obtained between leaf starch content and nitrate reductase activity in branches of both cultivars which had not flowered and between leaf total N content and nitrate reductase activity in branches of Langra which had flowered.